Breast pump adapter



FIG. 1 is a top perspective view of the breast pump adapter showing the design of my invention;

FIG. 2 is a bottom perspective view showing the design of my invention;

FIG. 3 is a side view showing the design of my invention;

FIG. 4 is a top plan view showing the design of my invention; and,

FIG. 5 is a bottom plan view showing the design of my invention. 

The ornamental design for a breast pump adapter, as shown and described. 